When I switched to 2.8 for character animation I noticed that pasting poses no longer triggers an automatic keyframe. It was very usefull for mirroring walk cycles and such, now the workflow takes 3 times as long because I have to switch selections everytime. Does anyone know if I can chage this back with a setting?
What version are you using? This may have been a bug and has since been fixed. I am using 2.8.6 and also tested on 2.81.16, and in both versions pasting a pose or a mirror of the pose adds key frames.
Yes, it’s fixed in newer versions, thanks 
For the record, I was on 2.81a (stable release, 5. December 2019)